Rhizome 6-7 mm thick, not or slightly glaucous, blackish when dry, medium to long-creeping, internodes 1.5-6 cm long, sometimes irregularly longer, branches arising about halfway along the internodes. Anatomy: vascular strands 16-19, without sclerified bundle sheaths, sclerenchyma strands 30-50, scattered, ground tissue not sclerified. Rhizome scales pseudopeltate, appressed, 7-8.5 by 2-4 mm, widest slightly above the point of attachment, clathrate with a narrow flabelloid margin of non-clathrate cells, light brown, dull to light iridescent, entire, apex obtuse to acute. Fronds stipitate; stipe 1-3.5 cm long, lamina to 62 by 6.5 cm or longer, widest at 1/3-1/2 its length, base narrowly acuminate, apex acute to slightly acuminate, glabrous or with very few, scattered, small, round, clathrate scales. Venation: main veins not visible or indistinct, running to halfway the margin or less, then splitting and disappearing in a mesh of areoles. Free veinlets many, recurrent and excurrent, ending in hydathodes. Hydathodes present. Sori to 5 mm wide, sometimes elongated longitudinally, in a single row at about 1/3 between midrib and margin, superficial, sometimes confluent across the veins, densely covered with scales when young. Sporangia stalk-ed, capsules c. 0.3 mm long, with 13-16 indurated annulus cells. Soral scales round, peltate, clathrate, to 0.7 mm diameter. Spores hyaline, 58-62 by c. 40 µm.
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